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  2. List of individual gemstones - Wikipedia

    en.wikipedia.org/wiki/List_of_individual_gemstones

    Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    The world's largest and most valuable gem opal "Olympic Australis" was found in August 1956 at the "Eight Mile" opal field in Coober Pedy. It weighs 17,000 carats (3.4 kg; 7.5 lb) and is 11 inches (280 mm) long, with a height of 4 + 3 ⁄ 4 in (120 mm) and a width of 4 + 1 ⁄ 2 in (110 mm).

  4. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    Meet the "Virgin Rainbow" – perhaps the finest and certainly the most expensive opal on record. It literally glows in the dark. In fact, as it gets darker around the opal, the opal appears ...

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Black Opal – the rarest type of opal Black opal is directly mined in New South Wales, Australia, making it the rarest type of opal. Having a darker composition, this gemstone can be in a variety of colours.

  6. The world's most valuable gem is made of dinosaurs and ... - AOL

    www.aol.com/news/2015-08-12-the-worlds-most...

    Colorless diamonds are so 2014. And so are all the other precious stones compared to the most recent finding. Meet the extremely rare and psychedelic gem that will make all the others look boring ...

  7. Hyalite - Wikipedia

    en.wikipedia.org/wiki/Hyalite

    The transparent or translucent mineraloid has a globular structure, a vitreous luster, and a white streak. Hyalite is an amorphous form of silica (SiO 2) formed as a volcanic sublimate in volcanic or pegmatic rock and is thereby considered a mineraloid. It contains 3–8% water, either as a silanol group or in molecular form.

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